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<h2>Java Serialization</h2>
muc dich la de muon luu 1 doi tuong ra file thi doc lai file day khoi phuc lai duoc doi tuong
phai thuc thi giao dien ava.io.Serializable
neu co 2 thuoc tinh a, b. De 1 thuoc tinh la transient thi khi khoi phuc se khong khoi phuc duoc thuoc tinh nay
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